<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>css-notes</title>
  <style type="text/css">
    [title=CSS3] {
      border: 5px solid blue;
    }
  </style>
</head>
<body>
<h1>可以应用样式：</h1>
<img title="CSS3" src="../../assets/images/css3-logo.svg" />
<br />
<a title="CSS3" href="https://developer.mozilla.org/en-US/docs/Web/CSS/CSS3">CSS3</a>
<hr />

<h1>无法应用样式：</h1>
<p title="greeting">Hi!</p>
<a class="CSS3" href="https://developer.mozilla.org/en-US/docs/Web/CSS/CSS3">CSS3</a>
</body>
</html>
